To get digits past the decimal point in Elixir, you can use the `div`

and `rem`

functions to extract the whole number and fractional parts of a number. Alternatively, you can convert the number to a string and use string manipulation functions to achieve the desired result. Another option is to use the `:erlang.float_to_binary`

function to convert the float to a binary and then manipulate the binary representation to extract the digits you need.

## What is the precision of arithmetic operations in Elixir?

Elixir uses arbitrary-precision arithmetic, meaning that operations on numbers will have full precision and not be limited by the size of the numbers being used. This allows for accurate calculations with integers and floating-point numbers of any size.

## What is the precision of floating-point numbers in Elixir?

Elixir uses 64-bit double-precision floating-point numbers, which have a precision of approximately 15-17 significant decimal digits. This is the same precision as the float data type in most programming languages.

## What is the result of subtracting a float from an integer in Elixir?

When subtracting a float from an integer in Elixir, the result will be a float. For example:

1 2 3 |
result = 10 - 3.5 IO.puts result # Output: 6.5 |

## What is the best practice for handling numerical precision in Elixir?

One common practice for handling numerical precision in Elixir is to use the Decimal library, which provides support for arbitrary precision decimal arithmetic. This ensures that calculations involving decimal numbers are accurate and do not lose precision due to floating-point errors.

Another approach is to use the Decimal data type in Ecto for database operations, which allows you to store and manipulate decimal numbers with precision in a database.

It is also important to pay attention to the data types used in calculations and conversions to avoid losing precision. For example, converting a float to an integer may result in rounding errors, so it is better to use Decimal or a similar data type for accurate calculations.

Additionally, using libraries like Decimal or BigNum for complex arithmetic operations can help ensure accurate results with numerical precision in Elixir.

## How to check if a number is an integer in Elixir?

To check if a number is an integer in Elixir, you can use the `Integer.is_integer/1`

function. Here's an example:

1 2 3 4 5 6 7 |
number = 10 if Integer.is_integer(number) do IO.puts("The number is an integer.") else IO.puts("The number is not an integer.") end |

This will output "The number is an integer." if the number is an integer, and "The number is not an integer." if it is not.

## How to truncate a number in Elixir?

You can truncate a number in Elixir using the `trunc/1`

function provided by the `:erlang`

module. Here's an example of how you can use it:

1 2 3 |
number = 5.6789 truncated_number = :erlang.trunc(number) IO.puts(truncated_number) |

This will output:

```
1
``` |
```
5
``` |

The `trunc/1`

function simply removes the decimal part of the number and returns the whole number part.